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– Electrical power lines
DANGER
Drilling into an electric power line will cause
the machine to become electrified and may
electrocute you or any bystanders.
◊ Keep bystanders and spectators away
from the job site, including the complete
bore path.
◊ Locate and expose all electric lines that
you will be crossing by careful hand
digging.
◊ Have the electric company turn off the
power to any lines you will be crossing
before drilling.
◊ Use the receiver to track the exact
position of the drill head when
approaching electric lines.
◊ Before drilling, setup and use the
Zap-Alert system which is designed to
notify in the case of an electric strike and
electrically isolate the machine operator
from the machine. If the Zap-Alert alarm
triggers, stop what you are doing and do
not leave the operator's position. Refer
to
Deploying the Zap-Alert System (page
24)
for detailed instructions on using the
Zap-Alert system.
– Crystalline silica and other dust
If you will be drilling through or cutting concrete,
sand, or other substances that create dusts or fumes,
you need to ensure that you and all workers wear
breathing protection to protect your lungs from the
dust.
WARNING
Machining or handling stone, masonry,
concrete, metal, and other materials can
generate dust, mists, and fumes containing
chemicals, such as silica, known to cause
serious or fatal injury or illness, such as
respiratory disease, silicosis, cancer, birth
defects, or other reproductive harm.
◊ Control dust, mist, and fumes at the
source where possible. Water should be
used for dust suppression when feasible.
◊ Use good work practices and follow the
recommendations of the manufacturer or
suppliers, OSHA, and other occupational
and trade associations.
◊ When the hazards from inhalation cannot
be eliminated, the operator and any
bystanders should wear a respirator
approved by OSHA for the material being
handled.
WARNING
Silicosis Warning: Grinding, cutting, or
drilling stone, masonry, concrete, metal,
and other materials with silica in their
composition may give off dust or mist
containing crystalline silica. Silica is a
basic component of sand, quartz, brick,
clay, granite, and numerous other minerals
and rocks. Repeated and/or substantial
inhalation of airborne crystalline silica can
cause fatal respiratory diseases, including
silicosis. In addition, some other authorities
have listed respirable crystalline silica as a
substance known to cause cancer. When
cutting such materials, follow respiratory
precautions.
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